these questions are always fun because there is no single correct answer. It always boils down to 1) who is your target audience and intended Genre and 2) what do you feel most comfortable with.
the first looks to precedent according to published books and what you typically find per genre, such that the total length of a story/novel is determined to be within a certain range which differs, such that Fantasy novels see a different length to Scifi and romance etc. the format is also important as published books often favour longer chapters (based on reaching a scene to a satisfying conclusion instead of the word count per se) as the turning of pages means readers aren't being reminded of its particular length. I have seen some chapters in fantasy go for about 13k words, only to be followed up by something just a few short pages of maybe not even 1k words. the shortest I have personally read concluded a certain chapter in just a single paragraph reaching not even 100 words, but it only happened once in the whole novel series.
Webnovels, such as what gets posted to sites like SH, RRL, syosetsu, Qidian etc the world over, you typically find brevity to be more popular so word count averaging around 2k words, which lots of writers making this an almost steadfast rule where ever chapter is almost the same length and this is constant through a whole series, no matter if it ends in 15 chapters or 1500.
these are just "what you tend to see and expect to find" however. in the second, the most important bit and the only rule that is consistent to all writers, is that you write until you are satisfied with the content and progress of a chapter. if that takes just 1k words, that is fine, if you are being as meticulous as possible but the word count still comes out to 3k or 5k etc, thats fine too. you did the hard work to write only what needed to be written, don't worry about how many words it took.
in published novels you find chapters always vary with the shortest and longest chapters possibly being differing in length by anywhere from 1k words to 5k words or more. Only really in webnovels do you find people write with very little spread in chapter length. just as it is important to have a variety of sentence and paragraph lengths in a chapter to keep the flow moving and easy to read, the chapters also need some variation to allow for the importance of scenes to be contrasted in the readers mind.
